well... its not easy... i fall asleep almost every time i try to do astral projection... when i dont fall asleep is because im too alert, but in this case my mind is too agitated to concentrate in anything, so i give up.
the technique i use is lay down in the most relaxed position i can, in a very quiet room, preferibly dark, close my eyes, put cotton into my ears to ensure complete silence, and concentrate all my attention in the act of breathing. i try dont think anything, just breathe. its hard cause soon the mind starts wandering again... then you have to start again... anyway, with the practice you can stay long periods of time just breathing, with the mind clear... then lots of strange things start to happen... my body feels like numbed, like it were just a warm mass, i cant differentiate my hands, legs, or whatever... like a very heavy body high... the silence into the mind is wonderful too... i feel a complete peace... when i used to did it every day, frequently i could feel what is called "vibrational state", which is said is the gateway for the astral projection... but i never remember have gone further than feeling it.
anyway, i assure you its worth the effort, just because this "vibrational state" is the more pleasant feeling i felt my entire life... somewhat like an orgasm in the entire body, during several seconds (much more than a "normal" orgasm which last just for instants)... yes... its fuckin good...
try hard and you will do it! good luck man! :thumbsup: